Adding auto delete workflow for backport branches (#289)#291

jmazanec15 merged 1 commit intoopensearch-project:1.xopensearch-project/k-NN:1.xfrom

VachaShah:backport/backport-289-to-1.xVachaShah/k-NN:backport/backport-289-to-1.xCopy head branch name to clipboard